Low voltage bipolar amplifier

Details Low voltage bipolar amplifier Low voltage bipolar amplifier

1994-08-01

1995-07-25

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including particular biasing arrangement

330261, H03F 304

Patent

active

054365953

ABSTRACT:
A bipolar transistor amplifier with improved base biasing is disclosed. In the bias circuit of the present invention, the bias current only varies with the log(log) of variations in .beta. of the NPN transistors, making the circuit particularly resistant to temperature and process induced variations in .beta.. A feedback loop also insures that the bias current will remain constant under normal operating conditions. In several embodiments of the present invention, the bias signal and the input signal are kept separate, reducing interference. The amplifier and bias circuit provides a large amount of voltage headroom even with low supply voltages.

REFERENCES:
patent: 3896394 (1975-07-01), Baro
patent: 4207537 (1980-06-01), Cave et al.
patent: 4274061 (1981-06-01), Kraemer
patent: 4575685 (1986-03-01), Dobkin et al.
patent: 5150076 (1992-09-01), Asazawa

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